layui.use('layer', function(){
    var $ = layui.jquery, layer = layui.layer;
    layer.open({
        type: 2 //此处以iframe举例
        ,title: '当你选择该窗体时，即会在最顶端'
        ,area: ['800px', '600px']
        ,shade: 0
        ,maxmin: true
        ,content: 'http://localhost:8080/ws/softphone/phone_voice.html'
        ,zIndex: layer.zIndex //重点1
    });
})